Weak sun poses radiation risk for Mars-bound astronauts

November 10, 2014 3:30 PM

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Illustration of how the sun's activity pushes out cosmic radiation from outside of the solar system. Also shown in the diagram are several NASA spacecraft that are far from Earth and heading out farther. (NASA)

Decreasing solar activity could make the journey to Mars and back riskier for astronauts, a new study warns.

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